将风激励作用转换为导线长度的周期变化,对单档距架空线路碳纤维复合芯导线无覆冰时的舞动特性展开了实验研究.与实验研究对应,用两端简支柔索结构参数共振模型对横向风载激发的导线舞动现象进行模拟.对具有相同截面尺寸的碳纤维复合芯导线和钢芯铝绞线的舞动现象进行了对比分析,从参数共振动力不稳定区域的角度解释了实验观测到的不同激振频率下两种导线系统的舞动模态.结果 表明,在相同静态张力加载下,相同截面尺寸的碳纤维复合芯导线相比于传统钢芯铝绞线更不易发生舞振现象.

近年来发现电流互感器(CT)普遍存在过量产氢的问题,目前对此问题已展开一定研究,但氢气来源和产生机理尚不明确.本文针对运行变电站的大量CT进行氢气含量监测,配合油色谱和CT解体实验,获取了过量产氢的特征,并进一步开展了模拟实验和机理分析.研究了含水量和温度、电流等因素对过量产氢的影响规律,通过实验得到了不同含水量和温度条件下的产氢量变化曲线,对比分析了含水量和温度对产氢速率的影响效果和机理以及通流条件对产氢速率的影响.分析了CT中氢气的主要材料来源和产氢的外部激励条件,初步揭示了过量产氢的理化机制,并据此对CT的制造和运行维护提出了合理化建议.

近年我国电网发生多次输电线路舞动故障,造成多条线路跳闸停电,其中以紧凑型线路为主.由于紧凑型线路相比常规线路相间距离较短,更易因为舞动发生相间放电.因此,对紧凑型线路进行防舞治理更为重要.文章结合紧凑型线路的运行特点,研究了利用相间间隔棒对紧凑型线路进行防舞治理的优化方案.通过运行情况证明,文章研究的相间间隔棒防舞配置方案具有较好的应用效果和适用性.

Voltage transformer (VT) in generator circuit is an important instrument for generator monitoring and controlling.Its insulation defect detection is closely associated with safe and reliable operation of generators.A novel detection method for insulation defects in generator circuit VT is proposed in this paper.Frequency characterization of lightning impulse reflection is provided using HV level output equipment.Correlation of VT insulation response to the same and different voltage amplitudes,resulting from lightning impulse,is analyzed.Discriminant function is adopted for insulation situation analysis and fault diagnosis from test data.With this method,better anti-jamming capability and stability of generator circuit VT is achieved.

As the lack of special on-line test technique,it is difficult to find the discharge due to the test tap vice of high voltage capacitive equipment,which may cause insulation breakdown accident.In this paper,a portable on-line test apparatus was developed and a diagnosis method was given by experiment researches.

电力电容器能够改善电力系统的电压质量和提高输电线路的输电能力,是电力系统中的重要设备.